Your post sounds like some sort of Stockholm Syndrome manifestation. The other poster found a bicycle seemingly abandoned in a public place, and the police response quite correctly sounds
ridiculous. That you so casually refer to yourselves as Gaijin -- which is a manifestation of Japan's incredible cultural insecurity and xenophobia -- should be indicting Japan, not somehow used to defend them. Gaijin or not [1], he has every right to have opinions about things.
Multiple detectives investigating a bicycle theft is absurd. This has positively nothing to do with the broken window theory, but instead is exactly what the article talks about which is an overstaffed police force with little to do.
And it doesn't have little to do because Japan is such a cultural gem. It has little to do because Japan is facing a population implosion as the population ages with few children. Youth and young adults are, unsurprisingly, responsible for most crime, and when you have few in that demographic crime drops. No surprise.
[1] It's interesting to think about this in the context of a Japanese person in, say, Canada. They meet with a ridiculous scenario with a ridiculous response, and when vocalizing to a coworker how ridiculous it is they are told that they are a smug foreigner and need to shut the hell up. That would be simply outrageous, and is the sort of thing the worst sort of racist would resort to.